Hey, I didn't know about this, but that free powerful cross-platform tracker music creation software that I also run a song archive about (and make music with) that I mentioned awhile back - can load in pictures and make them into sounds. Good sounding sounds. Good sounding sounds that sound good!
Here's a video of it working in action -
(Yeah, it's a bit small - to watch it bigger, go view it at YouTube by clicking on the video while it's running). There are some tutorials out there on YouTube about using SunVox, but I'll get on one soon. Anyway, have fun with this!